App launched through intent closes when leaving foreground

Hello
I'm working on an NFC app, so i added the ability to launch the app by tapping a nfc tag.

All works good, thing is when launched throu a "tap", the app cannot go into background, it will automatically die when anything makes it leave the foreground.

On a couple devices with android <5, it will die as soon as the task manager soft button is pressed, on another device running android 5, the task manager can be opened (and instead of my name/icon, i see "NFC SERVICE" with the nfc icon)...

App launched through intent closes when leaving foreground

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